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[/] [openrisc/] [trunk/] [orpsocv2/] [bench/] [sysc/] [src/] [TapStateMachine.cpp] - Rev 178
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// ---------------------------------------------------------------------------- // The TAP state machine: implementation // Copyright (C) 2009 Embecosm Limited <info@embecosm.com> // Contributor Jeremy Bennett <jeremy.bennett@embecosm.com> // This file is part of the Embecosm cycle accurate SystemC JTAG library. // This program is free software: you can redistribute it and/or modify it // under the terms of the GNU Lesser General Public License as published by // the Free Software Foundation, either version 3 of the License, or (at your // option) any later version. // This program is distributed in the hope that it will be useful, but WITHOUT // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public // License for more details. // You should have received a copy of the GNU Lesser General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. // The C/C++ parts of this program are commented throughout in a fashion // suitable for processing with Doxygen. // The C/C++ parts of this program are commented throughout in a fashion // suitable for processing with Doxygen. // ---------------------------------------------------------------------------- // $Id$ #include "TapStateMachine.h" //! Constructor //! Start in the Test-Logic-Reset state, although we cannot know this reflects //! the hardware until it has been through a TAP reset sequence. This is //! reflected in the ::tapResetDone flag. TapStateMachine::TapStateMachine () : state (TAP_TEST_LOGIC_RESET), resetDone (false) { } // TapStateMachine () //! Accessor to get the current TAP state //! Only guaranteed to match the target hardware if it has been through a //! reset sequence. //! @return The current TAP state TapState TapStateMachine::getState () { return state; } // getState () //! Accessor to get the current TAP reset state. //! It is the responsibility of classes using this class to correctly set this //! state. //! @return The current TAP reset state bool TapStateMachine::getResetDone () { return resetDone; } // getResetDone () //! Accessor to set the current TAP reset state. //! It is the responsibility of classes using this class to correctly set this //! state. //! @param[in] The desired TAP reset state void TapStateMachine::setResetDone (bool _resetDone) { resetDone = _resetDone; } // setResetDone () //! Drive the TAP state machine //! @param tms The JTAG TMS pin void TapStateMachine::nextState (bool tms) { static const TapState mapHigh[TAP_SIZE] = { // When TMS = 1/true TAP_TEST_LOGIC_RESET, // from TAP_TEST_LOGIC_RESET TAP_SELECT_DR_SCAN, // from TAP_RUN_TEST_IDLE TAP_SELECT_IR_SCAN, // from TAP_SELECT_DR_SCAN TAP_EXIT1_DR, // from TAP_CAPTURE_DR TAP_EXIT1_DR, // from TAP_SHIFT_DR TAP_UPDATE_DR, // from TAP_EXIT1_DR TAP_EXIT2_DR, // from TAP_PAUSE_DR TAP_UPDATE_DR, // from TAP_EXIT2_DR TAP_SELECT_DR_SCAN, // from TAP_UPDATE_DR TAP_TEST_LOGIC_RESET, // from TAP_SELECT_IR_SCAN TAP_EXIT1_IR, // from TAP_CAPTURE_IR TAP_EXIT1_IR, // from TAP_SHIFT_IR TAP_UPDATE_IR, // from TAP_EXIT1_IR TAP_EXIT2_IR, // from TAP_PAUSE_IR TAP_UPDATE_IR, // from TAP_EXIT2_IR TAP_SELECT_DR_SCAN}; // from TAP_UPDATE_IR static const TapState mapLow[TAP_SIZE] = { // When TMS = 0/false TAP_RUN_TEST_IDLE, // from TAP_TEST_LOGIC_RESET TAP_RUN_TEST_IDLE, // from TAP_RUN_TEST_IDLE TAP_CAPTURE_DR, // from TAP_SELECT_DR_SCAN TAP_SHIFT_DR, // from TAP_CAPTURE_DR TAP_SHIFT_DR, // from TAP_SHIFT_DR TAP_PAUSE_DR, // from TAP_EXIT1_DR TAP_PAUSE_DR, // from TAP_PAUSE_DR TAP_SHIFT_DR, // from TAP_EXIT2_DR TAP_RUN_TEST_IDLE, // from TAP_UPDATE_DR TAP_CAPTURE_IR, // from TAP_SELECT_IR_SCAN TAP_SHIFT_IR, // from TAP_CAPTURE_IR TAP_SHIFT_IR, // from TAP_SHIFT_IR TAP_PAUSE_IR, // from TAP_EXIT1_IR TAP_PAUSE_IR, // from TAP_PAUSE_IR TAP_SHIFT_IR, // from TAP_EXIT2_IR TAP_RUN_TEST_IDLE }; // from TAP_UPDATE_IR state = tms ? mapHigh[state] : mapLow[state]; } // nextState() //! Determine if we are in a particular TAP state //! Set TMS to get there optimally //! @param[in] target The desired TAP state //! @param[out] tms Value of TMS to move towards the target state. Set //! even if we are already in the state (in case we want //! to loop). //! @return True if we are already in the target state bool TapStateMachine::targetState (TapState target, bool &tms) { // Map of the value of TMS which moves the state machine from the the state // in the row (first) to the state in the column (second) static const bool map[TAP_SIZE][TAP_SIZE] = { // T R S C S E P E U S C S E P E U // L T D D D 1 D 2 D I I I 1 I 2 I // R I R R R D R D R R R R I R I R // S R R S R R { 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, // map[TLR][x] { 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[RTI][x] { 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1 }, // map[SDRS][x] { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[CDR][x] { 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[SDR][x] { 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[E1DR][x] { 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[PDR][x] { 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[E2DR][x] { 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }, // map[UDR][x] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0 }, // map[SIRS][x] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1 }, // map[CIR][x] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1 }, // map[SIR][x] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1 }, // map[E1IR][x] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1 }, // map[PIR][x] { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1 }, // map[E2IR][x] { 1, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }}; // map[UIR][x] tms = map[state][target]; return state == target; } // targetState()
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